Apple charger serial chek

you can try Check Your Service and Support Coverage - Apple Support

but mind you a serial number can be perfectly valid and still be present on a fake charger, it's not some magic number

How do I check the authenticity of iPhone… - Apple Community

Apple does not provide us any means to check a power adapter by serial number for authenticity. However, there are methods to do so ... and those methods would depend on what adapter you are using and what this adapter is being used with ...

... so, is this "charger" for an iPhone/iPad, or for a Mac?